Method and system for reducing downlink forward error correction process of kilomega passive optical network

A passive optical network and forward error correction technology, which is applied in the field of forward error correction processing for downlink data in gigabit passive optical networks, to achieve the effect of reducing complexity, reducing requirements and reducing costs

Inactive Publication Date: 2007-02-14
HUAWEI TECH CO LTD
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Problems solved by technology

[0007] The present invention provides a method and system for simplifying the downlink forward error correction processing of Gigabit passive optical network, so as to solve the problem in the prior

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  • Method and system for reducing downlink forward error correction process of kilomega passive optical network
  • Method and system for reducing downlink forward error correction process of kilomega passive optical network
  • Method and system for reducing downlink forward error correction process of kilomega passive optical network

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Embodiment Construction

[0026] In the following, the present invention will be further elaborated by taking GPON line rate 2.48832Gbps as an example according to specific embodiments.

[0027] Such as Figure 4 As shown, the system of the present invention includes a forward error correction FEC storage unit for storing fixed data, an FEC encoding processing module for performing FEC encoding processing on downlink data, and an FEC decoding processing module for performing FEC decoding processing on downlink data module. The storage unit is set in the FEC encoding processing module and the decoding processing module. For downlink processing, the FEC encoding processing module is generally set in the central office equipment, and the FEC decoding processing module is set in the terminal equipment.

[0028] When the GPON line rate is 2.48832Gbps, the downlink frame length is 38880 bytes. According to the algorithm: the downlink data length is 38880 divided by 255, and the remainder is 120. In the re...

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Abstract

This invention relates to a method and a device for forward error correction process to down data in a giga passive optical network GPON, in which, the method includes: a specific byte in the dowm data is set to be a fixed datum, the FEC process module adds said datum to the tail of the down data frame while coding and casts off said fixed datum when decoding, which casts aside the effective data of255 residual part in the GPON down frame and the system can work without adding FEC process modules and performances or altering the system clock frequency.

Description

[technical field] [0001] The invention relates to a data processing technology in a passive optical network, in particular to a method and a system for performing forward error correction (FEC) processing on downlink data in a gigabit passive optical network (GPON). [Background technique] [0002] Due to passive optical splitting in the downlink direction of the GPON network, the optical signal attenuation is relatively large, and the optical module received at the optical network unit (Optic Network Unit, ONU) side requires high sensitivity, resulting in an increase in system cost. The G.984 standard of GPON can optionally support a forward error correction (Forward Error Correction, FEC) function. FEC is a forward error correction code that uses RS (255, 239) encoding, that is, every 239 bytes of valid data is processed to obtain 16 bytes of redundant bytes, and 239 bytes of valid data are combined into a 255 byte data blocks for transmission. On the receiving side, acco...

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Application Information

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IPC IPC(8): H04L1/00H04Q11/00
Inventor 何军
Owner HUAWEI TECH CO LTD
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